[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBM 2.0 Strict ordering via ordering groups

[timfox]

"ataylor" wrote : anonymous wrote : What's the advantage in allowing multiple consumers? If you're ordering, then by definition, you will need to serialise consumption 
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  | I was just taking this from the comments on the Jira, 'In order to guarantee strict ordering, even on rollback or in the presence of multiple consumers or with xa transactions, the queue needs to ensure that no more than one message with the value of ordering group is being delivered at any one time.'
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I still don't see the advantage of multiple consumers.

anonymous wrote : 
  | So you send 10 messages, 5 for group A, with seq 1 to 5, and 5 for group B again with seq 1 to 5. A consumer consumes message group A seq 1 but does not acknowledge, the next message in group A with seq 2 can't be delivered but message group B seq 1 can, This gives you strict ordering within the defined group.
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Yes, but the current message grouping also provides that same ordering guarantee, does it not?

 anonymous wrote : 
  | The producer can specify on send the sequence number of a message to specify its delivery order.

I'm not sure what that means. Again, does not message groups preserve delivery order.

I'm just trying to understand here how message grouping does not accomplish the goal.

The goal here is to provide strict ordering of delivery of messages, even on rollback and with multiple consumers.

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